How to solve the problem with Roole in BEM?

Question

JSON

I study BEM on ru.bem.info/articles/start-with-project-stub After following
the instructions “Including libraries”, BEM cannot build index.html
in the terminal, it writes the following error:

15:12:03.506 - warn: *** HTTP error: 500, Error: Cannot find module 'roole'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (/home/irt/start-pretty-project/node_modules/bem/lib/techs/v2/roole.js:4:13)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)

What is this 'roole' module, where to get it and what to do with it?

Answer 1

The roole module is the CSS preprocessor Rool , installed in the project:
...but it is not needed at the moment, because project-stub and other main BEM projects have switched to stylus another CSS preprocessor, if your goal is to learn BEM by en. bem.info/articles/start-with-project-stub, start from the beginning.